Homeostasis_2 - More on Homeostasis A homeostatic control...

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More on Homeostasis
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Response No heat produced Room temperature decreases Heater turned off Set point Too hot Set point Control center: thermostat Room temperature increases Heater turned on Too cold Response Heat produced Set point A homeostatic control system has three functional components A receptor, a control center, and an effector
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Most homeostatic control systems function by negative feedback Where buildup of the end product of the system shuts the system off
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A second type of homeostatic control system is positive feedback Which involves a change in some variable that triggers mechanisms that amplify the change
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Thermoregulation contributes to homeostasis Thermoregulation Is the process by which animals maintain an internal temperature within a tolerable range
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In humans, a specific part of the brain, the hypothalamus Contains a group of nerve cells that function as a thermostat
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Thermostat in hypothalamus activates cooling mechanisms. Sweat glands secrete sweat that evaporates, cooling the body. Blood vessels in skin dilate: capillaries fill with warm blood; heat radiates from skin surface. Body temperature decreases; thermostat shuts off cooling mechanisms. Increased body temperature (such as when exercising or in hot surroundings) Homeostasis: Internal body temperature of approximately 36–38 ° C Body temperature increases; thermostat shuts off warming mechanisms. Decreased body temperature (such as when in cold surroundings) Blood vessels in skin constrict, diverting blood from skin to deeper tissues and reducing heat loss from skin surface.
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